HP LaserJet 4 Service Manual - Page 111

Removing and Replacing the Transfer Roller Figure 4-9 Replacing the Transfer Roller The Transfer Roller is the black sponge-rubber roller located inside the printer just to the front of the black plastic Paper Feed Guide (see Figure 4-9). To remove and replace the Transfer Roller, follow these steps. Note Do not handle the new Transfer Roller unnecessarily. Oils will build up on the roller and cause print quality problems. Preventive Maintenance 4-15